> For the complete documentation index, see [llms.txt](https://docs.developer.singpass.gov.sg/docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.developer.singpass.gov.sg/docs/technical-specifications.md).

# Technical Specifications

- [Changelog](https://docs.developer.singpass.gov.sg/docs/technical-specifications/changelog.md)
- [Integration Guide](https://docs.developer.singpass.gov.sg/docs/technical-specifications/integration-guide.md)
- [1. The Authorization Request](https://docs.developer.singpass.gov.sg/docs/technical-specifications/integration-guide/1.-authorization-request.md)
- [2. Handling the Redirect](https://docs.developer.singpass.gov.sg/docs/technical-specifications/integration-guide/2.-handling-the-redirect.md)
- [3. The Token Request](https://docs.developer.singpass.gov.sg/docs/technical-specifications/integration-guide/3.-token-exchange.md)
- [4. Parsing the ID Token](https://docs.developer.singpass.gov.sg/docs/technical-specifications/integration-guide/4.-parsing-the-id-token.md)
- [5. The Userinfo Request](https://docs.developer.singpass.gov.sg/docs/technical-specifications/integration-guide/5.-requesting-for-userinfo.md)
- [Technical Concepts](https://docs.developer.singpass.gov.sg/docs/technical-specifications/technical-concepts.md)
- [JSON Web Key Sets (JWKS)](https://docs.developer.singpass.gov.sg/docs/technical-specifications/technical-concepts/json-web-key-sets-jwks.md)
- [Generation Of Client Assertion](https://docs.developer.singpass.gov.sg/docs/technical-specifications/technical-concepts/generation-of-client-assertion.md)
- [Proof Key for Code Exchange (PKCE)](https://docs.developer.singpass.gov.sg/docs/technical-specifications/technical-concepts/proof-key-for-code-exchange-pkce.md)
- [Demonstrating Proof of Possession (DPoP)](https://docs.developer.singpass.gov.sg/docs/technical-specifications/technical-concepts/demonstrating-proof-of-possession-dpop.md)
- [OpenID Provider Configuration](https://docs.developer.singpass.gov.sg/docs/technical-specifications/technical-concepts/openid-connect-discovery.md)
- [Migration Guides](https://docs.developer.singpass.gov.sg/docs/technical-specifications/migration-guides.md)
- [Login / Myinfo (v5) apps](https://docs.developer.singpass.gov.sg/docs/technical-specifications/migration-guides/login-myinfo-v5-apps.md)
- [Myinfo (v3) apps](https://docs.developer.singpass.gov.sg/docs/technical-specifications/migration-guides/myinfo-v3-apps.md)
- [Myinfo (v4) apps](https://docs.developer.singpass.gov.sg/docs/technical-specifications/migration-guides/myinfo-v4-apps.md)
- [(Legacy) Pre-FAPI 2.0 API Specifications](https://docs.developer.singpass.gov.sg/docs/technical-specifications/singpass-authentication-api.md)
- [Overview of Singpass Flow](https://docs.developer.singpass.gov.sg/docs/technical-specifications/singpass-authentication-api/overview-of-singpass-flow.md)
- [1. Authorization Endpoint](https://docs.developer.singpass.gov.sg/docs/technical-specifications/singpass-authentication-api/1.-authorization-endpoint.md)
- [Redirection on success](https://docs.developer.singpass.gov.sg/docs/technical-specifications/singpass-authentication-api/1.-authorization-endpoint/redirection-on-success.md)
- [For Mobile Developers](https://docs.developer.singpass.gov.sg/docs/technical-specifications/singpass-authentication-api/1.-authorization-endpoint/for-mobile-developers.md)
- [2. Token Endpoint](https://docs.developer.singpass.gov.sg/docs/technical-specifications/singpass-authentication-api/2.-token-endpoint.md)
- [Authorization Code Grant](https://docs.developer.singpass.gov.sg/docs/technical-specifications/singpass-authentication-api/2.-token-endpoint/authorization-code-grant.md)
- [Client JWK Requirements](https://docs.developer.singpass.gov.sg/docs/technical-specifications/singpass-authentication-api/2.-token-endpoint/client-jwk-requirements.md)
- [3. Userinfo Endpoint](https://docs.developer.singpass.gov.sg/docs/technical-specifications/singpass-authentication-api/3.-userinfo-endpoint.md)
- [Requesting Userinfo](https://docs.developer.singpass.gov.sg/docs/technical-specifications/singpass-authentication-api/3.-userinfo-endpoint/requesting-userinfo.md)
- [Validating the payload](https://docs.developer.singpass.gov.sg/docs/technical-specifications/singpass-authentication-api/3.-userinfo-endpoint/validating-the-payload.md)
- [.well-known Endpoints](https://docs.developer.singpass.gov.sg/docs/technical-specifications/singpass-authentication-api/.well-known-endpoints.md)
- [OpenID Discovery Endpoint](https://docs.developer.singpass.gov.sg/docs/technical-specifications/singpass-authentication-api/.well-known-endpoints/openid-discovery-endpoint.md)
- [JWKS Endpoint](https://docs.developer.singpass.gov.sg/docs/technical-specifications/singpass-authentication-api/.well-known-endpoints/jwks-endpoint.md)
- [Error Response](https://docs.developer.singpass.gov.sg/docs/technical-specifications/singpass-authentication-api/error-response.md)


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